So why should someone else lose out for you? What arrogance.
Quite simple, No driver & no one willing to do a rest day or overtime, well that's game over. I won't do rest days or overtime for my lot, they don't pay the correct & going rate anymore so, I won't do it, nor will a significant number of others either.
So the loser will be the TOC because it costs them more to cancel it, than pay the going rate for overtime or rest days, that to me and most is a Tx1¼ - Tx1½.
Too right.
If you work a 4 out of 7 as I do, the average length of your jobs is between 9 hours and 9.5 hours, Some are 10.
You are usually rostered at least 1 spare a week, but you are often allocated a job on the 7 day mark up that was open. That may also be a long one.
Even if you get your spare, you will generally come in to somebody else's turn who went sick or a job that had been left open, which they frequently do. Or even worse, cross cover for another depot's open job.
Consequently, you can easily end up doing 4 days of 9-10 hour jobs. Why do you then want to be available for your rest day, when they can also allocate you another 10 hour day if one is open. At flat rate! Granted you might be lucky and get a short one and get paid the minimum 9 hours for it, but there aren't many of those about. So many (like me) just don't take the risk and work Sundays instead when you get the benefit.
The problem is the length and intensity of jobs and lack of proper spare turns. If you worked less on the days you were in you wouldn't mind doing the extra day, but when all the jobs you do are rough and then you risk getting another one for flat rate, why would you?